Like others approaching middle age, the World Economic Forum turns 50 insisting it has matured, that it has moved on from hard partying and wants more meaningful relationships.

US President Donald Trump will renew his running battle with young climate campaigner Greta Thunberg when they join the A-list movers and shakers attending the 50th anniversary of the Davos conclave next week. Donald Trump, Greta Thunberg, Davos

Swedish climate campaigner Greta Thunberg issued a warning to world leaders at a protest in the Swiss city of Lausanne on Friday, days before the start of the Davos summit of the world's political and business elites.